The 4.2 V8 is a very durable engine, and with the bulletproof drivetrain, this car should last anyone a good long time. That is, as long as you can keep up with all the wear-and-tear parts as they inevitably give out. Hoses and suspension components will crack and leak, especially in cold weather (but that's the trade off here for a car that's virtually unstoppable in deep snow). Parts are expensive because of the car's uniqueness, doubly so on cars with the V8 (it uses parts not found on any other Audi) instead of a V6. Can't argue with that V8 exhaust note and low-end torque, though!
The interior is standard Audi brilliance, and aside from a few scuffs, my example is in excellent condition after five years and 85,000 miles.